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- W100059146 abstract "Field tests of multilayer earthen covers for radon control have been conducted for the past two years at Grand Junction, Colorado, as part of the Department of Energy's Uranium Mill Tailings Remedial Action Project (UMTRAP) technology development. The initial tests conducted in 1980 used relatively thin (<20 cm), compacted layers of clay mixed with gravel as the control layer to limit radon escape from uranium tailings. The first multilayer system was applied in August of 1980 and has been monitored for over 1 year. Results have indicated that the compacted clay/gravel layers have been relatively effective in reducing radon flux. Flux reductions on one of the compacted plots ranged from 98 to 99.9%, but during the first year flux levels at all monitoring points were observed to exceed 2 pCi m/sup -2/ sec/sup -1/. The 1981 field test was designed to test multilayer earth cover systems that could reduce surface radon flux to less than 2 pCi m/sup -2/ sec/sup -1/. Materials used in the clay/gravel layer for radon control were tested in the laboratory prior to field application. Laboratory measured diffusion coefficients for the wet, compacted clay/gravel mixtures ranged from 2 to 8 x 10/sup -6/ cm/sup 2//sec. Fieldmore » measurements of clay/gravel layers indicate that compactions greater than 1.9 g/cm/sup 3/ could be achieved by conventional earth-moving equipment. The compacted layers were hydraulically isolated from the surface soil by a 0.2 m thick capillary barrier composed of 3 cm diameter washed rock. The capillary barrier was determined to be effective in retarding upward migration of water and salts.« less" @default.
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- W100059146 date "1981-01-01" @default.
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- W100059146 title "Radon control by multilayer earth barriers: 2. field tests" @default.
- W100059146 hasPublicationYear "1981" @default.
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